Abstract
The nonlinear refractive index of silica fiber (24 m) and erbium-doped fiber (10 m) is measured to within an accuracy of 5% by use of time-delayed photorefractive beam coupling of intense 53-ps, pulses that experience self-phase modulation in the fibers. The resultant induced grating autocorrelation response yields a value of and a calibration standard for the fiber. A phase shift of the order of can be detected and is limited only by laser amplitude fluctuations. A unique advantage of this technique is its ability to measure accurately in short lengths of fiber, whereas other approaches typically use much longer lengths of fiber .
© 2003 Optical Society of America
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